KR20230013990A - Method and apparatus for sidelink positioning in wireless communication system - Google Patents

Abstract

According to an embodiment of the present invention, a method for allowing a terminal to perform positioning through a side link in a wireless communication system comprises the following steps of: transmitting capability information of a terminal about positioning to other terminals and base stations; receiving positioning setting information from another terminal through a side link; and performing positioning through the side link based on the received positioning setting information.

Description

Sidelink positioning method and apparatus in wireless communication system {METHOD AND APPARATUS FOR SIDELINK POSITIONING IN WIRELESS COMMUNICATION SYSTEM}

The present disclosure relates to a wireless mobile communication system, and more particularly to a method and apparatus for performing positioning through a sidelink.

Looking back at the process of development through successive generations of wireless communication, technologies for human-targeted services, such as voice, multimedia, and data, have been developed. After the commercialization of 5G (5th-generation) communication systems, it is expected that connected devices, which have been explosively increasing, will be connected to communication networks. Examples of objects connected to the network may include vehicles, robots, drones, home appliances, displays, smart sensors installed in various infrastructures, construction machinery, and factory equipment. Mobile devices can be expected to evolve into various form factors such as augmented reality glasses, virtual reality headsets, and hologram devices. In the 6G (6th-generation) era, efforts are being made to develop an improved 6G communication system to provide various services by connecting hundreds of billions of devices and objects. For this reason, the 6G communication system is being called a (beyond 5G) system after 5G communication.

In the 6G communication system expected to be realized around 2030, the maximum transmission speed is tera (i.e., 1,000 gigabytes) bps, and the wireless delay time is 100 microseconds (μsec). That is, the transmission speed in the 6G communication system compared to the 5G communication system is 50 times faster and the wireless delay time is reduced to 1/10.

To achieve such high data rates and ultra-low latency, 6G communication systems use terahertz bands (such as the 95 GHz to 3 terahertz (3 THz) bands). An implementation in is being considered. In the terahertz band, it can be expected that the importance of technology that can guarantee signal reach, that is, coverage, will increase due to more serious path loss and atmospheric absorption compared to the mmWave band introduced in 5G. As the main technologies for ensuring coverage, radio frequency (RF) devices, antennas, new waveforms that are superior in terms of coverage than orthogonal frequency division multiplexing (OFDM), beamforming, and massive multiple- Multi-antenna transmission technologies such as input and multiple-output (massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, and large scale antenna must be developed. In addition, new technologies such as metamaterial-based lenses and antennas, high-dimensional spatial multiplexing technology using orbital angular momentum (OAM), and reconfigurable intelligent surface (RIS) are being discussed to improve coverage of terahertz band signals.

In addition, in order to improve frequency efficiency and system network, in the 6G communication system, full duplex technology in which uplink and downlink simultaneously utilize the same frequency resource at the same time, satellite and Network technology that integrates HAPS (high-altitude platform stations), network structure innovation technology that supports mobile base stations and enables network operation optimization and automation, dynamic frequency sharing through collision avoidance based on spectrum usage prediction (dynamic spectrum sharing) technology, AI (artificial intelligence) from the design stage, AI-based communication technology that realizes system optimization by internalizing end-to-end AI support functions, Development of next-generation distributed computing technology that realizes high-complexity services by utilizing ultra-high-performance communication and computing resources (mobile edge computing (MEC), cloud, etc.) is underway. In addition, through the design of a new protocol to be used in the 6G communication system, the implementation of a hardware-based security environment, the development of a mechanism for safe use of data, and the development of technology for maintaining privacy, connectivity between devices is further strengthened and networks are further strengthened. Attempts are ongoing to optimize, promote softwareization of network entities, and increase the openness of wireless communications.

Due to the research and development of these 6G communication systems, a new level of hyper-connected experience (the next hyper-connected experience) can be expected to become possible. Specifically, it can be expected that services such as truly immersive extended reality (truly immersive XR), high-fidelity mobile hologram, and digital replica will be possible through the 6G communication system. . In addition, services such as remote surgery, industrial automation, and emergency response through security and reliability enhancement are provided through the 6G communication system, which can be applied in various fields such as industry, medical care, automobiles, and home appliances. It will be.

The present disclosure relates to a wireless mobile communication system, and more particularly to a method and apparatus for performing positioning through a sidelink. Specifically, the present disclosure relates to a method for transmitting and receiving related information to measure a location of a terminal, a method for setting and transmitting a signal for measuring a location, a method for measuring a location through the same, and terminal operation.

A method for performing positioning by a terminal through a sidelink in a wireless communication system according to an embodiment of the present disclosure includes transmitting capability information of the terminal related to positioning to another terminal and a base station; Receiving positioning configuration information from the other terminal through a side link; and performing positioning through a sidelink based on the received positioning configuration information.

The present disclosure is to propose a method and procedure for performing positioning by a UE through a sidelink. Through the proposed method, position measurement can be made possible in the sidelink.

1 is a diagram showing a system according to an embodiment of the present disclosure.
2 is a diagram illustrating a communication method performed through a sidelink according to an embodiment of the present disclosure.
3 is a diagram for explaining a resource pool defined as a set (set) of resources on time and frequency used for sidelink transmission and reception according to an embodiment of the present disclosure.
4 is a diagram for explaining a case of calculating a location of a UE through a sidelink by applying an SSP according to an embodiment of the present disclosure.
5 is a diagram for explaining a case of calculating a location of a terminal through a sidelink according to a third embodiment of the present disclosure.
6 is a diagram for explaining a case of calculating a location of a terminal through a sidelink according to a fourth embodiment of the present disclosure.
7 is a diagram for explaining a case of calculating a location of a terminal through a sidelink according to a fifth embodiment of the present disclosure.
8 is a block diagram illustrating the internal structure of a terminal according to an embodiment of the present disclosure.
9 is a block diagram illustrating the internal structure of a base station according to an embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure without obscuring it by omitting unnecessary description.

For the same reason, in the accompanying drawings, some components are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In each figure, the same reference number is assigned to the same or corresponding component.

Advantages and features of the present disclosure, and methods of achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms, only the present embodiments make the present disclosure complete, and those of ordinary skill in the art to which the present disclosure belongs It is provided to fully inform the person of the scope of the present disclosure, and the present disclosure is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

At this time, it will be understood that each block of the process flow chart diagrams and combinations of the flow chart diagrams can be performed by computer program instructions. These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates means to perform functions. These computer program instructions may also be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular way, such that the computer usable or computer readable memory The instructions stored in are also capable of producing an article of manufacture containing instruction means that perform the functions described in the flowchart block(s). The computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to generate computer or other programmable data processing equipment. Instructions for performing processing equipment may also provide steps for performing the functions described in the flowchart block(s).

Additionally, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is possible for the functions mentioned in the blocks to occur out of order. For example, two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in reverse order depending on their function.

At this time, the term '~unit' used in this embodiment means software or a hardware component such as FPGA or ASIC, and '~unit' performs certain roles. However, '~ part' is not limited to software or hardware. '~bu' may be configured to be in an addressable storage medium and may be configured to reproduce one or more processors. Therefore, as an example, '~unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. Functions provided within components and '~units' may be combined into smaller numbers of components and '~units' or further separated into additional components and '~units'. In addition, components and '~units' may be implemented to play one or more CPUs in a device or a secure multimedia card. Also, in the embodiment, '~ unit' may include one or more processors.

In the specific description of the embodiments of the present disclosure, the radio access network New RAN (NR) on the 5G mobile communication standard disclosed by the 3rd generation partnership project long term evolution (3GPP), a mobile communication standardization organization, and the packet core (a core network) 5G System, or 5G Core Network, or NG Core: next generation core) as the main target, but the main point of the present disclosure is to other communication systems having a similar technical background to the extent that it does not greatly depart from the scope of the present disclosure. It can be applied with slight modifications, which will be possible with the judgment of those skilled in the art of the present disclosure.

In the 5G system, in order to support network automation, a network data collection and analysis function (NWDAF), which is a network function that provides a function of analyzing and providing data collected from the 5G network, can be defined. NWDAF can collect/store/analyze information from the 5G network and provide the result to an unspecified network function (NF), and the analysis result can be used independently in each NF.

For convenience of description below, some terms and names defined in the 3GPP standards (5G, NR, LTE, or similar system standards) may be used. However, the present disclosure is not limited by terms and names, and may be equally applied to systems conforming to other standards.

Also used in the following description are terms for identifying access nodes, terms for network entities (network entities), terms for messages, terms for interfaces between network entities, and various types of identification information. Terms and the like referring to are illustrated for convenience of description. Therefore, it is not limited to the terms used in this disclosure, and other terms that refer to objects having equivalent technical meanings may be used.

In order to meet the growing demand for wireless data traffic after the commercialization of the 4G communication system, development efforts are being made to improve the 5G communication system (NR, New Radio). In order to achieve a high data rate, the 5G communication system is designed to enable resources in a mmWave band (eg, a 28 GHz frequency band). In order to mitigate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) are used in 5G communication systems. ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, unlike LTE, the 5G communication system volunteers various subcarrier spacings such as 30 kHz, 60 kHz, and 120 kHz, including 15 kHz, and uses Polar Coding for the physical control channel. The data channel (Physical Data Channel) uses LDPC (Low Density Parity Check). In addition, not only DFT-S-OFDM but also CP-OFDM are used as waveforms for uplink transmission. While LTE supports HARQ (Hybrid ARQ) retransmission in TB (Transport Block) units, 5G can additionally support CBG (Code Block Group)-based HARQ retransmission in which several CBs (Code Blocks) are bundled.

In addition, to improve the network of the system, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), and an ultra-dense network , Device to Device communication (D2D), wireless backhaul, vehicle communication network (V2X (Vehicle to Everything) network), cooperative communication, CoMP (Coordinated Multi-Points), and reception Technology development such as interference cancellation is being made.

On the other hand, the Internet is evolving from a human-centered connection network in which humans create and consume information to an Internet of Things (IoT) network in which information is exchanged and processed between distributed components such as things. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with a cloud server, etc., is also emerging. In order to implement IoT, technical elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, sensor networks for connection between objects and machine to machine , M2M), and MTC (Machine Type Communication) technologies are being studied. In the IoT environment, intelligent IT (Internet Technology) services that create new values in human life by collecting and analyzing data generated from connected objects can be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliances, advanced medical service, etc. can be applied to

Accordingly, various attempts are being made to apply the 5G communication system to the IoT network. For example, technologies such as sensor network, machine to machine (M2M), and machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antenna, which are 5G communication technologies. . The application of the cloud radio access network (cloud RAN) as the big data processing technology described above can be said to be an example of convergence of 5G technology and IoT technology. In this way, a plurality of services can be provided to users in a communication system, and in order to provide such a plurality of services to users, a method capable of providing each service within the same time period according to characteristics and a device using the same are required. . Various services provided by 5G communication systems are being studied, and one of them is a service that satisfies low latency and high reliability requirements. Demand for mobile services is also exploding, with location-based services (LBS) growing rapidly, primarily driven by two key requirements: emergency services and commercial applications. In particular, in the case of communication using a sidelink, in the NR sidelink system, unicast communication between terminals, groupcast (or multicast) communication, and broadcast communication are supported. In addition, NR Sidelink is different from LTE Sidelink, which is intended to transmit and receive basic safety information required for vehicle road driving, for group driving, advanced driving, extended sensor, and remote driving. ) aims to provide more advanced services such as

In particular, in the NR sidelink, positioning may be performed through a sidelink between terminals. In other words, a method of measuring the location of a UE using a positioning signal transmitted through a sidelink may be considered. An existing method of measuring the position of a terminal using a positioning signal transmitted through downlink and uplink between the terminal and the base station is possible only when the terminal is within the coverage of the base station. However, when sidelink positioning is introduced, location measurement of the UE may be possible even when the UE is out of coverage of the base station. The present disclosure proposes a method for exchanging related information to measure the location of a terminal through a sidelink, a method for configuring and transmitting a signal for measuring the location, and a method for measuring the location through this.

Embodiments of the present specification are proposed to support the above-described scenario, and in particular, an object of providing a method and apparatus for measuring a location of a UE in a sidelink.

1 is a diagram showing a system according to an embodiment of the present disclosure.

Referring to FIG. 1, (a) of FIG. 1 illustrates an example of a case in which all terminals (UE-1 and UE-2) communicating through a sidelink are located within the coverage of a base station (In-Coverage, IC). indicate All terminals can receive data and control information from the base station through downlink (DL) or transmit data and control information to the base station through uplink (UL). At this time, the data and control information may be data and control information for side link communication. Data and control information may be data and control information for general cellular communication. In addition, terminals can transmit/receive data and control information for corresponding communication through Sidelink (SL).

Referring to FIG. 1, (b) of FIG. 1 shows an example of a case in which UE-1 is located within the coverage of a base station and UE-2 is located outside the coverage of the base station. That is, (b) of FIG. 1 shows an example of partial coverage (PC) in which some UEs (UE-2) are located outside the coverage of the base station. A terminal (UE-1) located within the coverage of the base station may receive data and control information from the base station through downlink or transmit data and control information to the base station through uplink. A terminal (UE-2) located outside the coverage of the base station cannot receive data and control information from the base station through downlink, and cannot transmit data and control information through uplink to the base station. The terminal (UE-2) can transmit/receive data and control information for corresponding communication through the side link with the terminal (UE-1).

Referring to FIG. 1, (c) of FIG. 1 shows an example of a case where all terminals are located outside the coverage of a base station (OOC). Therefore, the terminals UE-1 and UE-2 cannot receive data and control information from the base station through downlink, and cannot transmit data and control information to the base station through uplink. The terminals UE-1 and UE-2 may transmit/receive data and control information through the sidelink.

Referring to FIG. 1, (d) of FIG. 1 shows an example of a scenario in which sidelink communication is performed between UEs (UE-1 and UE-2) located in different cells. Specifically, (d) of FIG. 1 shows a case in which the UEs UE-1 and UE-2 are connected to different base stations (RRC connected state) or are camping (RRC disconnected state, ie, RRC idle state). show In this case, UE-1 may be a transmitting UE in the sidelink, and UE-2 may be a receiving UE. Alternatively, UE-1 may be a receiving UE in the sidelink, and UE-2 may be a transmitting UE. The terminal UE-1 may receive a system information block (SIB) from a base station to which it is connected (or to which it is camping), and the terminal UE-2 to which it is connected (or to which it is camping). can receive SIBs from other base stations. In this case, an existing SIB or a separately defined SIB for sidelink communication may be used as the SIB. Also, SIB information received by UE-1 and SIB information received by UE-2 may be different from each other. Therefore, in order to perform sidelink communication between terminals (UE-1 and UE-2) located in different cells, a method of interpreting SIB information transmitted from different cells by unifying information or signaling information about this information is required. Additional may be required.

Although FIG. 1 shows a sidelink system composed of two terminals (UE-1 and UE-2) for convenience of description, communication may be performed between more terminals without being limited thereto. In addition, interfaces (uplink and downlink) between a base station and terminals may be referred to as a Uu interface, and sidelink communication between terminals may be referred to as a PC5 interface. Therefore, in the present disclosure, they may be used interchangeably. Meanwhile, in the present disclosure, a terminal may mean a general terminal and a terminal supporting vehicular-to-everything (V2X). Specifically, in the present disclosure, a terminal may mean a handset (eg, a smart phone) of a pedestrian. Alternatively, a vehicle supporting vehicle-to-vehicular (V2V) communication, a vehicle supporting vehicle-to-pedestrian (V2P) communication, or vehicle-to-network communication (vehicular-to-network, V2N) ), or a vehicle supporting vehicle-to-infrastructure (V2I) communication. In addition, in the present disclosure, a terminal may include a road side unit (RSU) equipped with a terminal function, an RSU equipped with a base station function, or an RSU equipped with a part of a base station function and a part of a terminal function. In addition, according to an embodiment of the present disclosure, the base station may be a base station supporting both V2X communication and general cellular communication, or a base station supporting only V2X communication. In this case, the base station may be a 5G base station (gNB), a 4G base station (eNB), or an RSU. Therefore, in the present disclosure, a base station may be referred to as an RSU.

2 is a diagram illustrating a communication method performed through a sidelink according to an embodiment of the present disclosure.

Referring to (a) of FIG. 2, UE-1 (201, eg TX terminal) and UE-2 (202, eg RX terminal) may perform one-to-one communication, which is It can be called unicast communication. In the sidelink, capability information and configuration information can be exchanged between terminals through PC5-RRC defined in a unicast link between terminals. In addition, configuration information may be exchanged through a sidelink medium access control control element (MAC CE) defined in a unicast link between terminals.

Referring to (b) of FIG. 2, the TX terminal and the RX terminal may perform one-to-many communication, which may be referred to as groupcast or multicast. In (b) of FIG. 2, UE-1 211, UE-2 212, and UE-3 213 form a group (Group A) to perform groupcast communication. And, the UE-4 (214), UE-5 (215), UE-6 (216), and UE-7 (217) form another group (Group B) to communicate through groupcast can be performed. Each terminal performs groupcast communication only within the group to which it belongs, and communication between different groups may be performed through unicast, groupcast, or broadcast communication. In (b) of FIG. 2, it is shown that two groups (Group A and Group B) are formed, but it is not limited thereto.

Meanwhile, although not shown in FIG. 2, terminals may perform broadcast communication in the sidelink. Broadcast communication refers to a case in which all other terminals receive data and control information transmitted by a transmitting terminal through a side link. For example, in (b) of FIG. 2, if it is assumed that UE-1 (211) is a transmitting terminal for broadcasting, all terminals (UE-2 (212), UE-3 (213), UE -4 (214), UE-5 (215), UE-6 (216), and UE-7 (217)) can receive data and control information transmitted by UE-1 (211).

In NR V2X, unlike in LTE V2X, a form in which a vehicle terminal sends data to only one specific node through unicast and a form in which data is sent to a plurality of specific nodes through groupcast can be considered. For example, such unicast and group cast technologies can be usefully used in service scenarios such as platooning, which is a technology in which two or more vehicles are connected to one network and moved in a cluster form. Specifically, unicast communication may be required for the purpose of controlling one specific node by a leader node of a group connected by group driving, and group cast communication may be required for the purpose of simultaneously controlling a group consisting of a number of specific nodes. there is.

3 is a diagram for explaining a resource pool defined as a set (set) of resources on time and frequency used for sidelink transmission and reception according to an embodiment of the present disclosure. A resource granularity on the time axis in a resource pool may be a slot. Also, a resource allocation unit on the frequency axis may be a sub-channel composed of one or more physical resource blocks (PRBs). In the present disclosure, an example of a case in which resource pools are allocated non-contiguously in time is described, but resource pools may be allocated in succession in time. In addition, in the present disclosure, an example of a case in which resource pools are contiguously allocated in frequency is described, but a method in which resource pools are discontiguously allocated in frequency is not excluded.

,

,

,...)로 도시 되었다. 301에서 색칠된 부분은 자원 풀에 속한 사이드링크 슬롯들을 나타낸다. 자원 풀에 속한 사이드링크 슬롯들은 비트맵을 통해 자원 풀 정보로 (pre-)configuration될 수 있다. 302를 참조하면, 시간상에서 자원 풀에 속한 사이드링크 슬롯의 셋(집합)이 (

,

,

,...)로 도시 되었다. 본 개시에서 (pre-)configuration의 의미는 단말에 pre-configuration되어 미리 저장되어 있는 설정 정보를 의미할 수도 있고, 단말이 기지국으로부터 cell-common한 방법으로 configuration되는 경우를 의미할 수 도 있다. 여기서 cell-common은 셀안의 단말들이 기지국으로부터 동일한 정보의 설정을 수신함을 의미할 수 있다. 이때, 단말은 기지국으로부터 사이드링크 SL-SIB (sidelink system information block)을 수신하여 cell-common한 정보를 획득하는 방법이 고려될 수 있다. 또한 (pre-)configuration의 의미는 단말이 기지국과 RRC 연결이 수립된 이후 UE-specific한 방법으로 configuration되는 경우를 의미할 수 도 있다. 여기서 UE-specific은 UE-dedicated라는 용어로 대체될 수 도 있으며 단말마다 특정한 값으로 설정 정보를 수신함을 의미할 수 있다. 이때, 단말은 기지국으로부터 RRC 메시지를 수신하여 UE-specific한 정보를 획득하는 방법이 고려될 수 있다. 또한 (pre-)configuration은 자원 풀 정보로 설정되는 방법과 자원 풀 정보에 설정되지 않는 방법이 고려될 수 있다. 자원 풀 정보로 (pre-)configuration되는 경우는 단말이 기지국과 RRC 연결이 수립된 이후 UE-specific한 방법으로 configuration되는 경우를 제외하고는 해당 자원 풀에서 동작하는 단말들은 모두 공통된 설정 정보로 동작될 수 있다. 하지만 (pre-)configuration이 자원 풀 정보에 설정되지 않는 방법은 기본 적으로 자원 풀 설정 정보와 독립적으로 설정되는 방법이다. 예를 들어, 자원 풀에 하나 이상의 모드가 (pre-)configuration 되고 (예를들어, A, B, 그리고 C), 자원 풀 설정 정보와 독립적으로 (pre-)configuration된 정보를 통해 자원 풀에 (pre-)configuration된 모드 중 어떤 모드를 사용할지 (예를들어, A 또는 B 또는 C)가 지시될 수 있다. Referring to FIG. 3, a case 301 in which resource pools are allocated non-contiguously in time is shown. Referring to FIG. 3, a case in which the granularity of resource allocation in time consists of slots is illustrated. First, a sidelink slot may be defined within a slot used for uplink. Specifically, the length of a symbol used as a sidelink within one slot may be set as sidelink BWP (Bandwidth Part) information. Therefore, among slots used for uplink, slots for which the length of symbols set for sidelink is not guaranteed cannot be sidelink slots. In addition, a slot in which a Sidelink Synchronization Signal Block (S-SSB) is transmitted is excluded from slots belonging to a resource pool. Referring to 301, except for these slots, the set (set) of slots that can be used as sidelinks in time (

,

,

,...). Colored parts in 301 represent sidelink slots belonging to the resource pool. Sidelink slots belonging to a resource pool may be (pre-)configurated with resource pool information through a bitmap. Referring to 302, the set (set) of sidelink slots belonging to the resource pool in time (

,

,

,...). In the present disclosure, the meaning of (pre-)configuration may mean configuration information pre-configurated and stored in a terminal, or may mean a case in which a terminal is configured in a cell-common manner from a base station. Here, cell-common may mean that terminals in the cell receive configuration of the same information from the base station. At this time, a method in which the UE receives cell-common information by receiving a sidelink SL-SIB (sidelink system information block) from the base station may be considered. Also, the meaning of (pre-)configuration may mean a case in which the terminal is configured in a UE-specific manner after the RRC connection with the base station is established. Here, UE-specific may be replaced with the term UE-dedicated, and may mean that configuration information is received with a specific value for each UE. At this time, a method of obtaining UE-specific information by receiving an RRC message from the base station may be considered. In addition, (pre-)configuration can be considered a method in which resource pool information is set and a method in which resource pool information is not set. In the case of (pre-)configuration with resource pool information, all terminals operating in the resource pool will be operated with common configuration information, except for the case where the terminal is configured in a UE-specific way after the RRC connection with the base station is established. can However, the method in which (pre-)configuration is not set in the resource pool information is basically set independently of the resource pool configuration information. For example, one or more modes are (pre-)configurated in the resource pool (eg, A, B, and C), and the resource pool configuration information is independently (pre-)configurated information to the resource pool (for example, A, B, and C). Which of the pre-)configurated modes to use (eg, A or B or C) may be indicated.

Referring to 303 in FIG. 3, a case in which resource pools are continuously allocated on a frequency is illustrated. In the frequency axis, resource allocation may be configured with sidelink Bandwidth Part (BWP) information and may be performed in units of sub-channels. A subchannel may be defined as a resource allocation unit on a frequency composed of one or more physical resource blocks (PRBs). That is, a subchannel may be defined as an integer multiple of PRB. Referring to 303, a subchannel may be composed of 5 consecutive PRBs, and a subchannel size (sizeSubchannel) may be the size of 5 consecutive PRBs. However, the content shown in the figure is only an example of the present disclosure, and the size of a subchannel may be set differently, and one subchannel is generally composed of consecutive PRBs, but does not necessarily have to be composed of consecutive PRBs. A subchannel may be a basic unit of resource allocation for PSSCH. In 303, startRB-Subchannel may indicate a start position of a subchannel on a frequency in a resource pool. When resource allocation is performed in units of subchannels on the frequency axis, the RB (Resource Block) index at which the subchannel starts (startRB-Subchannel), information on how many PRBs the subchannel consists of (sizeSubchannel), and the total number of subchannels Resources on a frequency may be allocated through setting information such as (numSubchannel). At this time, information on startRB-Subchannel, sizeSubchannel, and numSubchannel may be (pre-)configurated as resource pool information on a frequency.

One of the methods for allocating transmission resources in the sidelink is a method of allocating sidelink transmission resources from the base station when the terminal is within the coverage of the base station. Hereinafter, this method will be referred to as Mode 1. In other words, Mode 1 may indicate a method in which the base station allocates resources used for sidelink transmission to RRC-connected terminals in a dedicated scheduling scheme. The method of Mode 1 can be effective for interference management and resource pool management because the base station can manage sidelink resources. Unlike this, among the methods for allocating transmission resources in the sidelink, there is a method in which the terminal allocates transmission resources through direct sensing in the sidelink. Hereinafter, this method will be referred to as Mode 2. In the case of Mode 2, it may be referred to as UE autonomous resource selection. Unlike Mode 1, in which the base station directly participates in resource allocation, in Mode 2, the transmitting terminal autonomously selects resources through a sensing and resource selection procedure defined based on a (pre-)configurated resource pool, and selects resources through the selected resources. Send data. Next, when transmission resources through Mode1 or Mode2 are allocated, the terminal can transmit/receive data and control information through the sidelink. Here, the control information may include SCI format 1-A as 1st stage ^Sidelink Control Information (SCI) transmitted through a Physical Sidelink Control Channel (PSCCH). In addition, the control information may include at least one of SCI format 2-A and SCI format 2-B as 2 ^nd stage SCI transmitted through PSSCH (Physical Sidelink Shared Channel).

Next, a method of using a positioning reference signal (PRS) transmitted through downlink and uplink of the terminal and the base station as positioning for measuring the position of the terminal will be described. In the present disclosure, a method using a positioning signal transmitted through downlink and uplink of a terminal and a base station is referred to as radio access technology (RAT) dependent positioning. Also, other positioning methods may be classified as RAT-independent positioning. Specifically, in the case of an LTE system, methods such as Observed Time Difference Of Arrival (OTDOA), Uplink Time Difference Of Arrival (UTDOA), and Enhanced Cell Identification (E-CID) may be used as RAT-dependent positioning techniques. For NR systems, DL-TDOA (Downlink Time Difference Of Arrival), DL-AOD (Downlink Angle-of-Departure), Multi-RTT (Multi-Round Trip Time), NR E-CID, UL-TDOA (Uplink Time Methods such as Difference Of Arrival) and Uplink Angle-of-Arrival (UL-AOA) may be used. In contrast, RAT-independent positioning techniques may include methods such as Assisted Global Navigation Satellite Systems (A-GNSS), Sensors, Wireless Local Area Network (WLAN), and Bluetooth.

In this disclosure, the focus is particularly on RAT-dependent positioning methods supported through sidelinks. As mentioned above, RAT-dependent positioning is possible only when the UE is within the coverage of the base station. In addition, in the case of RAT-dependent positioning, positioning protocols such as LTE Positioning Protocol (LPP), LTE Positioning Protocol Annex (LPPa), and NR Positioning Protocol Annex (NRPPa) may be used. First, LPP is a positioning protocol defined between a terminal and a location server (LS), and LPPa and NRPPa can be regarded as protocols defined between a base station and a location server. Here, the location server is a subject that manages location measurement and may perform a location management function (LMF) function. A location server may also be called LMF or some other name. For both LTE and NR systems, LPP is supported, and the following roles for positioning can be performed through LPP. The terminal and the location server perform the following roles, and the base station may perform a role of allowing the terminal and the location server to exchange positioning information. At this time, the exchange of positioning information through LPP can be made transparent to the base station. This may mean that the base station is not involved in exchanging positioning information between the terminal and the location server. LPP may include the following components.

* Positioning capability exchange

* Send assistance data

* Send location information

* error handling

* abort

In the case of the positioning capability exchange, positioning information supportable by the terminal may be exchanged with the location server. For example, it may be whether the positioning method supported by the terminal is UE-assisted or UE-based, or whether both of these are possible. Here, UE-assisted means a method in which the terminal does not measure the absolute position of the terminal directly, but transmits only the measurement value for the positioning technique to the location server based on the received positioning signal applied, and the absolute position of the terminal is calculated by the location server. . Here, the absolute position may mean 2-dimensional (x, y) and 3-dimensional (x, y, z) coordinate location information of the terminal by longitude and latitude. In contrast, in the case of UE-based, a method in which the terminal directly measures the absolute position of the terminal may be used. To this end, the terminal receives the positioning signal and provides the location information of the subject who sent the positioning signal together. need to receive

While only the UE-assisted scheme is supported in the LTE system, both UE-assisted and UE-based positioning can be supported in the NR system. Next, transmission of assistance data may be a very important factor in positioning to accurately measure the location of a terminal. Specifically, in the case of transmission of assistance data, the location server may provide configuration information about positioning signals, candidate cells to receive positioning signals, and TRP (Transmission Reception Point) information to the terminal. In detail, when DL-TDOA is used, candidate cell and TRP information for receiving a positioning signal may be reference cell and reference TRP information and neighbor cell and neighbor TRP information. In addition, a plurality of candidates for neighbor cells and neighbor TRPs are provided, and information on which cells and TRPs the UE should select to measure a positioning signal may be provided together. In order for the UE to accurately measure the location, it is necessary to select the reference candidate cell and TRP information well. For example, as the channel for the positioning signal received from the candidate cell and the TRP is a Line-Of-Site (LOS) channel, that is, a channel having fewer NLOS (Non-LOS) channel components, the accuracy of positioning measurement increases. can Accordingly, when the location server provides the terminal with candidate cell and TRP information, which are references for performing positioning through various information collection, the terminal can perform more accurate positioning measurement.

Next, location information transmission can be performed through LPP. The location server may request location information from the terminal, and the terminal may provide the measured location information to the location server according to the request. In the case of UE-assisted, corresponding location information may be a measurement value for a positioning technique based on a received positioning signal. In contrast, in case of UE-based, corresponding location information may be 2-dimensional (x, y) and 3-dimensional (x, y, z) coordinate location values of the UE. When the location server requests location information from the terminal, it may include required accuracy and response time as positioning quality of service (QoS) information. When the corresponding positioning QoS information is requested, the terminal needs to provide the location information measured to satisfy the corresponding accuracy and response time to the location server, and if it is impossible to satisfy the QoS, error handling and abort will be able to consider However, this is only an example, and error handling and interruption of positioning may be performed in other cases other than the case where it is impossible to satisfy QoS.

Next, in the case of the positioning protocol defined between the base station and the location server, it is named LPPa in the LTE system, and the following functions may be performed between the base station and the location server.

* Transmission of E-CID location information

* Transmission of OTDOA information

* Report general error status

* Send assistance information

Next, in the case of the positioning protocol defined between the base station and the location server, it is named NRPPa in the NR system, and the following functions may be additionally performed between the base station and the location server, including the role performed by the above LPPa.

* Transmission of positioning information

* Transmission of measurement information

* Transmission of TRP information

Unlike the LTE system, in the NR system, it is possible to perform positioning measurement in a base station through a positioning sound reference signal (SRS) transmitted by a terminal. Accordingly, the positioning information transmission represents a function in which information related to setting and activating/deactivating the positioning SRS is exchanged between the base station and the location server. Next, measurement information transmission represents a function of exchanging information related to Multi-RTT, UL-TDOA, and UL-AOA, which is not supported in the LTE system, between the base station and the location server. Finally, TRP information transmission represents a role in exchanging information related to positioning based on TRP, since positioning is performed based on cells in the LTE system, but positioning can be performed based on TRP in the NR system.

In order to measure the location of a UE in a sidelink, a subject performing positioning-related settings and a subject calculating positioning may be classified into three types as follows.

* UE (no LS)

* LS (through BS)

* LS (through UE)

First, in the above, LS (Location Server) means a location server, BS (Base Station) means a base station such as a gNB or eNB, and UE means a terminal that transmits and receives data through a sidelink. As described above, terminals that perform transmission and reception through sidelinks may be vehicle terminals and pedestrian terminals. In addition, a terminal performing transmission and reception through a sidelink may include a road side unit (RSU) equipped with a terminal function, an RSU equipped with a base station function, or an RSU equipped with a part of a base station function and a part of a terminal function. . In addition, a terminal performing transmission and reception through a sidelink may include a positioning reference unit (PRU) in which the location of the terminal is known. The UE (no LS) means a sidelink terminal that has no connection with a location server. LS (through BS) is a location server and represents a location server connected to a base station. Unlike this, LS (through UE) is a location server and represents a location server connected to a sidelink terminal. In this case, the LS (through UE) may be available only to a specific terminal such as an RSU or a PRU rather than a general terminal. Also, a terminal connected to the location server in the sidelink may be defined as a new type of device. In addition, only a specific terminal supporting the UE capability to be connected to the location server may perform a function to be connected to the location server through the side link.

Cases 1 to 9 in Table 1 represent various combinations according to an entity that performs positioning-related settings and an entity that calculates positioning in order to measure the location of a UE in a sidelink. In the present disclosure, a terminal that needs to measure the location of a terminal is named a target terminal. In addition, a terminal whose location is known and capable of providing the corresponding information to measure the location of a target terminal is called an anchor terminal. In the case of an anchor terminal, it may be a terminal that already knows the location (known location). Note that the names of the target terminal and the anchor terminal may be replaced with other terms. For example, an anchor terminal may be named a Positioning Reference Unit (PRU). In addition, positioning configuration can be divided into UE-configured and Network-configured methods. In Table 1, when the positioning configuration is UE (no LS), the UE-configured scheme may be applied. In the case of the UE-configured method, there is an advantage in that positioning configuration is possible even when the terminal is not within network (base station) coverage. In Table 1, when the positioning setting is LS (through BS), a network-configured method may be applied. In the case of the network-configured method, when the UE is within network coverage, positioning calculation and measurement information is reported to the base station, and the location server connected to the base station performs location measurement of the target UE. Although delay may occur due to this, more accurate position measurement may be possible. Finally, in Table 1, when the positioning configuration is LS (through UE), it may not be classified as a network-configured method because the UE does not operate through a base station within network coverage. In addition, although the location server connected to the terminal measures the location, it may not be classified as a UE-configured method because it is not strictly measured in the terminal. Therefore, in the case of LS (through UE), it may be named in a method other than the UE-configured or network-configured method.

In addition, positioning calculation can be divided into two methods, UE-assisted and UE-based, as described above. In Table 1, when the positioning calculation is UE (no LS), it corresponds to UE-based, and when the positioning calculation is LS (through BS) or LS (through UE), it may generally correspond to UE-assisted. However, if the positioning calculation is LS (through UE) and the UE is the target UE, it may be classified as UE-based.

[Table 1]

In Table 1, the positioning configuration information may include Sidelink Positioning Reference Signal (S-PRS) configuration information. The S-PRS configuration information may be information related to S-PRS pattern information and time/frequency transmission location. In addition, in Table 1, in the positioning calculation, the UE receives the S-PRS, the measurement may be performed from the received S-PRS, and the positioning measurement and calculation method may vary depending on which positioning method is applied. Measurement of location information in sidelink may be absolute positioning that provides 2-dimensional (x, y) and 3-dimensional (x, y, z) coordinate position values of the terminal, and relative 2-dimensional or 3-dimensional position information from other terminals. It can also be relative positioning that provides Also, in the sidelink, the location information may be ranging information including either a distance or a direction from another terminal. If the location information in the sidelink includes both distance and direction information, ranging may have the same meaning as relative positioning. In addition, SL-TDOA (Sidelink Time Difference Of Arrival), SL-AOD (Sidelink Angle-of-Departure), SL Multi-RTT (Sidelink Multi-Round Trip Time), Sidelink E-CID, SL-AOA (Sidelink Angle-of-Arrival) and the like may be considered.

In the following embodiment, methods for supporting RAT-dependent positioning supported through sidelinks are proposed. Specifically, the following embodiments describe a method for exchanging related information to measure the location of a UE through a sidelink, a method for configuring and transmitting a signal for measuring a location, a method for measuring a location through the same, and operation of the UE. It is about. In the present disclosure, one or more of the following embodiments may be used in combination with each other.

<First Embodiment>

In the first embodiment, a protocol for RAT-dependent positioning supported through a sidelink is presented. First, the corresponding protocol may be named SPP (Sidelink Positioning Protocol). Note, however, that the term SPP may be replaced by other terms. Alternatively, a method in which the function of the SPP proposed in this embodiment is added to an existing LPP component may be considered. Also note that SPP may not be used when performing positioning on the sidelink. In other words, SPP may be applied only in specific cases. SPP may be a case where the positioning setting and positioning calculation based on the sidelink described through Table 1 are performed in the location server. Specifically, it may be a case where a location server such as LS (through BS) or LS (through UE) is involved in positioning configuration and positioning calculation.

4 is a diagram for explaining a case of calculating a location of a UE through a sidelink by applying an SSP according to an embodiment of the present disclosure.

However, this is only one embodiment, and the case where SPP can be applied in the present disclosure is not limited to the drawing shown in FIG. 4 .

4(a) is an example of LS (through BS), in which a location server 400 connected to a base station 401 may provide positioning settings to sidelink terminals 402, 403, and 404. 4(a) may correspond to a case where the positioning calculation can be performed by the location server 400 using the positioning measurement result reported by the target terminal 402 when the UE-assisted method is used.

4 (b) shows another embodiment of LS (through BS). Unlike FIG. 4 (a), in FIG. 4 (b), UE-to-NW relay 405 through sidelink is applied, so that even when the target device 402 is located outside the coverage of the base station, information related to positioning between the location server and the device It may be possible to exchange via the base station 401. Although the target terminal 402 is shown as connected to the relay terminal 405 in FIG. 4 (b), the anchor terminals 403 and 404 can also perform UE-to-NW relay through the relay terminal 405. . Here, the UE-to-NW relay may include a procedure in which the terminal 402 selects the relay terminal 405 within the coverage of the base station. When the relay terminal 405 is selected, the terminal 402 can receive information (control and data signals) from the base station through the relay terminal 405 . Specifically, when the base station 401 transmits information to the relay terminal 405, the terminal 402 can receive the information transmitted by the base station from the relay terminal 405 through a side link. Therefore, in FIG. 4 (b), when the location server 400 connected to the base station 401 provides positioning settings to the sidelink terminals 402, 403, and 404, and the UE-assisted method is used, the target terminal ( This may be the case where the location server 400 can perform positioning calculation using the positioning measurement result reported by 402).

4 (c) shows an embodiment for a LS (through UE). 4(c) shows a target device ( This may be the case where the location server 400 can perform positioning calculation using the positioning measurement result reported by 402). Although the terminal 404 is shown as an RSU in FIG. 4 (c), this is only an example, and the terminal 404 is not limited to the RSU. In other words, a terminal to which the location server is connected in the sidelink may be defined as a new type of device. In addition, only the terminal specified by the UE capability may perform a function of being connected to the location server through the side link. For example, when a group cast is performed on a sidelink, a leader terminal may be a terminal connected to a location server.

In this embodiment, when a location server is used in a sidelink and positioning is performed, what roles and information are required will be described. Specifically, SPP may include the following components. The roles of each component described in the above LPP can be equally applied and included in the SPP below. Below we will focus on features related to positioning in the sidelink.

* Positioning capability exchange

** Frequency band information used by the UE in the sidelink may be exchanged with positioning capability information. In this case, the frequency domain information may be sidelink Bandwidth Part (BWP) information. When the information is transmitted to the location server, the location server may perform positioning based on the information. In addition, the location server may adjust (change and extend) the frequency domain in which the terminal operates in the sidelink based on the corresponding information, and may transmit information about the adjusted frequency domain to the terminal.

** Resource pool information used by the terminal in the sidelink may be exchanged with positioning capability information. Here, resource pool information may be interpreted as time and frequency resource domain information used for sidelink transmission and reception. Also, the resource pool information may be a dedicated resource pool used for positioning. In the case of a dedicated resource pool used for positioning, only positioning-related signals can be transmitted and received in the corresponding pool. When the information is transmitted to the location server, the location server may perform positioning based on the information. In addition, the location server may adjust (change and expand) the resource pool area in which the terminal operates in the sidelink based on the corresponding information, and may transmit information about the adjusted resource pool area to the terminal.

** In the sidelink, S-PRS configuration information usable by the UE and a positioning method that can be supported may be exchanged as positioning capability information. When the information is transmitted to the location server, the location server may perform positioning based on the information. In addition, the location server may adjust the S-PRS settings transmitted by the terminal in the sidelink based on the corresponding information or adjust the positioning method and deliver it to the terminal.

** Information on whether the UE can perform UE-to-NW relay in the sidelink may be exchanged as positioning capability information. That information will be sent to the location server so that the location server can perform positioning based on the information. Specifically, information for positioning may be exchanged between the location server and the terminal through a relay terminal.

* Send assistance data

** The location server may provide configuration information about the S-PRS and candidate anchor terminal information to receive the S-PRS to the terminal. At this time, candidate anchor terminal information to receive the S-PRS may include UE ID (identification) information.

** In order for the location server to be able to provide information on candidate anchor devices to receive the S-PRS to the UE, it is necessary for the sidelink UE to provide UE ID information to the location server. This can be classified as assistance data transmission. However, in the present disclosure, an operation in which a terminal provides UE ID information to a location server through SPP may be classified into other components. The UE ID provided by the sidelink terminal to the location server may be a source ID used for sidelink, a destination ID used for sidelink, a sidelink synchronization ID, an S-PRS ID, or a cell ID to which the terminal belongs. In addition, the UE ID provided by the sidelink terminal to the location server may be configured and used as one or more combinations of the aforementioned IDs.

* Send location information

** The location server may request location information from the sidelink terminal, and the terminal may provide the measured location information to the location server according to the request. In this case, the location information may be different depending on whether it is UE-assisted or UE-based. In this case, the level of the location information may be different depending on whether the requested location information is absolute positioning, relative positioning, or ranging in a sidelink. In addition, the measurement method and measured value may vary depending on which positioning method is used in the sidelink. When the location server requests location information from the terminal, it may include required accuracy and response time in positioning QoS (Quality of Service) information. When the corresponding positioning QoS information is requested, the UE needs to provide the measured location information to the location server to satisfy the corresponding accuracy and response time.

* error handling

** Error processing can be performed when the location information measured in the sidelink is not valid. For example, if the measured location information value does not satisfy the response time, it may be an error process.

* abort

** When positioning-related performance is no longer possible in the sidelink, positioning-related procedures may be stopped. For example, when radio link failure (RLF) is declared in the sidelink, since transmission and reception through the sidelink may be impossible for a while, the sidelink positioning operation may be stopped.

Components and roles of SPP may not be limited to the above-mentioned content. In other words, additional components and roles may be considered for sidelink positioning using a location server.

<Second Embodiment>

In the second embodiment, a method for configuring and transmitting a signal for a terminal to measure a position through a sidelink is proposed.

First, whether or not the terminal can perform positioning through the sidelink, in other words, whether the terminal is a terminal capable of performing a positioning operation is determined by the terminal capability, and the corresponding capability information can be transmitted to other terminals and base stations. . In this case, whether or not the terminal can perform positioning through the sidelink may be determined by whether or not the sidelink positioning signal is transmitted/received. Here, the sidelink positioning signal may be a sidelink positioning reference signal (S-PRS) transmitted and received for positioning measurement. For example, a specific sidelink terminal may be a terminal capable of both transmitting and receiving S-PRS. In addition, a specific sidelink terminal may be a terminal capable of transmitting S-PRS but not receiving S-PRS. In addition, a specific sidelink terminal may be a terminal capable of receiving S-PRS but not performing S-PRS transmission. Also, a specific sidelink terminal may be a terminal that cannot perform both transmission and reception of S-PRS. Whether such UE can transmit/receive S-PRS may be defined as UE capability.

Next, when the terminal performs positioning through the sidelink, positioning-related configuration information may be (pre-)configurated. For example, S-PRS information may be (pre-)configurated as positioning-related information. As another example, information about a positioning method may be (pre-)configurated as positioning-related information. If, as discussed in Table 1, when the terminal does not receive positioning settings from other terminals or a location server, the terminal may follow positioning setting information pre-configured and stored in the terminal. For example, this case may be a case where the terminal is out of network coverage. Another example may be a case where no positioning-related setting information is received from another terminal. After a certain point in time, the terminal will be able to receive configuration of positioning configuration information from other terminals or location servers. If the UE (no LS) or LS (through UE) of Table 1 corresponds to and receives positioning information configuration from another UE, the positioning configuration information is broadcast, unicast, or group cast information transmitted through the side link. , and corresponding information may be indicated through SCI (1 ^st stage SCI or 2 ^nd stage SCI), or may be indicated through PC5-RRC or sidelink MAC-CE in the case of unicast transmission. If it corresponds to LS (through UE) and the terminal itself is connected to the location server, the terminal itself can receive positioning information configuration from the location server. In contrast, in the case of receiving configuration of positioning configuration information from a location server connected to a base station corresponding to the LS (through BS) of Table 1, the positioning configuration information may be configured in a cell-common way between the terminal and the base station. Here, cell-common may mean that terminals in the cell receive configuration of the same information from the base station. At this time, a method in which the UE receives cell-common information by receiving a sidelink SL-SIB (sidelink system information block) from the base station may be considered. It may also mean a case where the terminal is configured in a UE-specific manner after the RRC connection with the base station is established.

As described above, when the terminal does not receive positioning settings from other terminals or a location server, the terminal may transmit or receive a positioning signal according to positioning setting information pre-configurated and stored in the terminal. When a terminal receives configuration of positioning information from another terminal or a location server after a specific time point, the set information may be one or more than one. For example, in the case of S-PRS information, it may be determined that only one pattern is set, and more than one pattern information may be allowed to be set. When one or more pattern information is set, the terminal may transmit the corresponding setting information to the location server through the SPP described in the first embodiment, and the location server may determine an appropriate S-PRS pattern and instruct the terminal. As another example, it may be determined that information on positioning methods is set in only one method, and information on more than one positioning method may be allowed to be set. Here, the information on the positioning method may include information on whether it is UE-based or UE-assistance. Alternatively, the information on the positioning method may include information about absolute positioning, relative positioning, or ranging. Alternatively, the information on the positioning method may include information on whether it is SL-TDOA, SL-AOD, SL Multi-RTT, Sidelink E-CID, or SL-AOA. When one or more pattern information is set, the terminal transmits the corresponding setting information to the location server through the SPP described in the first embodiment, and the location server determines an appropriate positioning method based on the corresponding setting information and instructs the terminal. You will be able to.

Finally, when the UE performs positioning through the sidelink, the UE may transmit a positioning signal through the sidelink. Here, the positioning signal may be referred to as S-PRS. S-PRS transmission methods in the sidelink may be classified into the following two.

* Anchor device transmits S-PRS to target device

* Target device transmits S-PRS to anchor device

Depending on the positioning method used, both of the above may be performed or only one of the two may be performed. For example, sidelink positioning may be performed by transmitting S-PRS as the first method when SL-TDOA is performed. In contrast, when SL Multi-RTT is performed, both of the above two S-PRS transmissions may be required. When both of the S-PRS transmissions are performed, the S-PRS used in the first and the S-PRS used in the second may be the same type of positioning signal or may be different types of positioning signals.

<Third Embodiment>

In the third embodiment, a positioning procedure for a case where a location server does not participate in positioning-related settings when the location of a terminal is measured through a sidelink is presented. Specifically, a method for exchanging related information and signals to measure a location in a corresponding case and an operation for measuring a location through the corresponding operation are presented.

In a sidelink environment, since the case where the terminal is not within network coverage is always considered, if it is assumed that the location server is connected to the base station, the case where the location server fails to perform positioning-related configuration must be considered. In this case, the present embodiment proposes an operation in which a target device that needs to measure the location of a device performs positioning-related settings. Indications for various positioning-related configuration information presented in the second embodiment can be broadcast, unicast, or group-cast from a target terminal to another terminal through a side link. Corresponding information may be indicated through SCI (1 ^st stage SCI or 2 ^nd stage SCI) or may be indicated through PC5-RRC or sidelink MAC-CE in case of unicast transmission. At this time, the corresponding information may also include a request signal for the S-PRS. In other words, the target terminal may indicate related positioning configuration information together while instructing a request signal for S-PRS to neighboring terminals through the sidelink. In addition, when UE-based positioning is considered, a method in which the target terminal directly measures the absolute position of the terminal may be considered. If, in this way, in order for the target terminal to directly measure the absolute position of the terminal, it is necessary for the anchor terminal to indicate the known location to the target terminal through a sidelink. An anchor terminal may indicate a known location to a target terminal by broadcasting, unicasting, or group-casting information about a known location through a sidelink. Information on the known location may be indicated through SCI (1 ^st stage SCI or 2 ^nd stage SCI), or may be indicated through PC5-RRC or sidelink MAC-CE in the case of unicast transmission.

5 is a diagram for explaining a case of calculating a location of a terminal through a sidelink according to a third embodiment of the present disclosure. However, in the present disclosure, the case of calculating the location of the terminal through the sidelink according to the third embodiment is not limited to the case shown in FIG. 5 .

5(a) shows an example of a case where a sidelink terminal not connected to a location server provides positioning settings and a target terminal not connected to a location server performs positioning calculation. This may correspond to 1 in Table 1. In this case, the method presented in the third embodiment may be used as a method for the sidelink terminal to provide and indicate positioning configuration information. In addition, the target device may perform positioning calculation based on the provided configuration information.

5(b) shows an example of a case in which a sidelink terminal not connected to a location server provides positioning configuration and a target terminal is located within network coverage and performs positioning calculation in a location server connected to a base station. This may correspond to 2 in the case of Table 1. In this case, the method presented in the third embodiment may be used as a method for the sidelink terminal to provide and indicate positioning configuration information. In addition, the target terminal performs positioning measurement based on the provided configuration information, and since the target terminal is within the coverage of the base station, it can report the measured positioning information to the base station. Then, the corresponding measurement information is reported to the location server connected to the base station, and the location server can perform positioning calculations.

5(c) shows an example of a case where a sidelink terminal not connected to a location server provides positioning settings and the location server performs positioning calculation through the sidelink terminal connected to the location server. This may correspond to 3 in Table 1. In this case, the method presented in the third embodiment may be used as a method for the sidelink terminal to provide and indicate positioning configuration information. In addition, the target device performs positioning measurement based on the provided configuration information, and since the target device is within the sidelink coverage of the device connected to the location server, it can report the measured positioning information to the device connected to the location server. In FIG. 5(c), the terminal connected to the location server is shown as an anchor UE (RSU), but note that it may be a non-RSU terminal. Afterwards, the corresponding measurement information is reported to the location server connected to the anchor UE (RSU), and the location server can perform positioning calculations.

<The fourth embodiment>

The fourth embodiment presents a positioning procedure for a case where a location server connected to a base station provides positioning-related settings when the location of a terminal is measured through a sidelink. Specifically, a method for exchanging related information and signals to measure a location in a corresponding case and an operation for measuring a location through the corresponding operation are presented.

When the location server connected to the base station provides positioning-related settings, operation may be possible through positioning information settings and positioning procedures through an existing LPP. In this case, the positioning support method refers to the above-described LPP and SPP.

6 is a diagram for explaining a case of calculating a location of a terminal through a sidelink according to a fourth embodiment of the present disclosure. However, the case of calculating the location of the terminal through the sidelink according to the fourth embodiment is not limited to the case shown in FIG. 6 in the present disclosure.

6(a) shows an example of a case where a sidelink terminal is located within network coverage and a positioning server connected to a base station provides positioning settings and a target terminal not connected to the location server performs positioning calculation. This may correspond to 4 in Table 1. In this case, the method presented in the fourth embodiment (using LPP and SPP) may be used as a method of providing and instructing the positioning setting information in the location server connected to the base station. In addition, the target device may perform positioning calculation based on the provided configuration information.

6(b) is an example of a case where a sidelink terminal is located within network coverage and a location server connected to a base station provides positioning settings and a target terminal is located within network coverage and performs positioning calculation in a location server connected to a base station. indicates This may correspond to 5 in Table 1. In this case, the method presented in the fourth embodiment (using LPP and SPP) may be used as a method of providing and instructing the positioning setting information in the location server connected to the base station. In addition, the target terminal performs positioning measurement based on the provided configuration information, and since the target terminal is within the coverage of the base station, it can report the measured positioning information to the base station. Then, the corresponding measurement information is reported to the location server connected to the base station, and the location server can perform positioning calculations.

6(c) shows an example of a case where a sidelink terminal is located within network coverage and a location server connected to a base station provides positioning settings and performs positioning calculation in the location server through the sidelink terminal connected to the location server. This may correspond to 6 in Table 1. In this case, the method presented in the fourth embodiment (using LPP and SPP) may be used as a method of providing and instructing the positioning setting information in the location server connected to the base station. In addition, the target device performs positioning measurement based on the provided configuration information, and since the target device is within the sidelink coverage of the device connected to the location server, it can report the measured positioning information to the device connected to the location server. Although the terminal connected to the location server is shown as an anchor UE (RSU) in FIG. 6(c), note that it may be a non-RSU terminal. Afterwards, the corresponding measurement information is reported to the location server connected to the anchor UE (RSU), and the location server can perform positioning calculations.

<Fifth Embodiment>

The fifth embodiment presents a positioning procedure for a case where a location server connected to a sidelink terminal provides positioning-related settings when the location of a terminal is measured through a sidelink. Specifically, a method for exchanging related information and signals to measure a location in a corresponding case and an operation for measuring a location through the corresponding operation are presented.

When the location server connected to the terminal provides positioning-related settings, it may be possible to operate through the above-described positioning information setting and positioning procedure through the SPP.

In this case, the present embodiment proposes an operation in which the terminal connected to the location server indicates positioning-related setting information through a seed link. A terminal connected to the location server may broadcast, unicast, or group cast an indication of various positioning-related configuration information presented in the second embodiment to another terminal through a side link. Corresponding information may be indicated through SCI (1 ^st stage SCI or 2 ^nd stage SCI) or may be indicated through PC5-RRC or sidelink MAC-CE in case of unicast transmission. At this time, the corresponding information may also include a request signal for the S-PRS. In addition, when UE-based positioning is considered, a method in which the target terminal directly measures the absolute position of the terminal may be considered. If the target device directly measures the absolute position of the device in this way, the anchor device needs to indicate the known location to the target through the sidelink. As a method for an anchor terminal to indicate a known location as a target, broadcast, unicast, or group cast through a side link can be considered. Corresponding information may be indicated through SCI (1 ^st stage SCI or 2 ^nd stage SCI) or may be indicated through PC5-RRC or sidelink MAC-CE in case of unicast transmission.

7 is a diagram for explaining a case of calculating a location of a terminal through a sidelink according to a fifth embodiment of the present disclosure. However, in the present disclosure, the case of calculating the location of the terminal through the sidelink according to the fifth embodiment is not limited to the case shown in FIG. 7 .

7(a) shows an example of a case in which positioning settings are provided by a location server through a sidelink terminal connected to the location server and a target terminal not connected to the location server performs positioning calculation. This may correspond to 7 in Table 1. In this case, the method suggested in the fifth embodiment (using SPP) may be used as a method of providing and instructing the positioning setting information in the location server connected to the terminal. In addition, the target device may perform positioning calculation based on the provided configuration information.

7(b) shows an example of a case where the location server provides positioning settings through a sidelink terminal connected to the location server and the target terminal is located within network coverage and performs positioning calculation in the location server connected to the base station. This may correspond to 8 in Table 1. In this case, the method suggested in the fifth embodiment (using SPP) may be used as a method of providing and instructing the positioning setting information in the location server connected to the terminal. In addition, the target terminal performs positioning measurement based on the provided configuration information, and since the target terminal is within the coverage of the base station, it can report the measured positioning information to the base station. Then, the corresponding measurement information is reported to the location server connected to the base station, and the location server can perform positioning calculations.

7(c) shows an example of a case where the location server provides positioning settings through a sidelink terminal connected to the location server and performs positioning calculation in the location server through a sidelink terminal connected to the location server. This may correspond to 9 in Table 1. In this case, the method suggested in the fifth embodiment (using SPP) may be used as a method of providing and instructing the positioning setting information in the location server connected to the terminal. In addition, the target device performs positioning measurement based on the provided configuration information, and since the target device is within the sidelink coverage of the device connected to the location server, it can report the measured positioning information to the device connected to the location server. Although the terminal connected to the location server is shown as an anchor UE (RSU) in FIG. 7(c), note that it may be a non-RSU terminal. Afterwards, the corresponding measurement information is reported to the location server connected to the anchor UE (RSU), and the location server can perform positioning calculations.

Specific examples for explaining the above-described first to fifth embodiments are only combinations of at least one of the methods or operations for sidelink positioning proposed in the present disclosure. In addition, sidelink positioning may be performed by combining methods or operations disclosed in different embodiments. For example, by combining the operation of receiving positioning setting information from the sidelink terminal in the third embodiment and the operation of receiving positioning setting information from the location server in the fourth embodiment, some positioning setting information is obtained from the sidelink terminal. and some other positioning configuration information may be received from a location server. However, this is only an example, and each method or operation of two or more different embodiments may be combined for sidelink positioning.

In order to perform the above embodiments of the present disclosure, a transmitter, a receiver, and a processor of a terminal and a base station are shown in FIGS. 8 and 9, respectively. In the above embodiments, a method for performing positioning by a terminal in a sidelink is shown, and to perform this, a receiving unit, a processor, and a transmitting unit of a base station and a terminal must each operate according to an embodiment.

Specifically, FIG. 8 is a block diagram showing the internal structure of a terminal according to an embodiment of the present disclosure. As shown in FIG. 8 , a terminal of the present disclosure may include a terminal receiving unit 802 , a terminal transmitting unit 804 , and a processor 806 . The terminal receiver 802 and the terminal transmitter 804 may be collectively referred to as a transceiver in an embodiment of the present disclosure. The transmitting/receiving unit may transmit/receive signals with other devices. For example, the transmitting/receiving unit may transmit/receive signals with at least one of other terminals, base stations, and location servers. The signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting its frequency. Also, the transceiver may receive a signal through a radio channel, output the signal to the processor 806, and transmit the signal output from the processor 806 through the radio channel. The processor 806 may control a series of processes so that the terminal can operate according to the above-described embodiment of the present disclosure.

9 is a block diagram showing the internal structure of a base station according to an embodiment of the present disclosure. As shown in FIG. 9 , the base station of the present disclosure may include a base station receiver 902 , a base station transmitter 904 , and a processor 906 . The base station receiving unit 902 and the base station transmitting unit 904 may collectively be referred to as transceivers in an embodiment of the present disclosure. The transmission/reception unit may transmit/receive signals with the terminal. In addition, the transmitting and receiving unit may transmit and receive signals to and from the location server. The signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for low-noise amplifying a received signal and down-converting its frequency. Also, the transceiver may receive a signal through a wireless channel, output the signal to the processor 906, and transmit the signal output from the processor 906 through the wireless channel. The processor 906 may control a series of processes so that the base station operates according to the above-described embodiment of the present disclosure.

On the other hand, the embodiments of the present disclosure disclosed in the present specification and drawings are only presented as specific examples to easily explain the technical content of the present disclosure and help understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other modifications based on the technical idea of the present disclosure are possible. In addition, each of the above embodiments can be operated in combination with each other as needed. For example, parts of all embodiments of the present disclosure may be combined with each other to operate a base station and a terminal.

Claims (1)

In a method for a terminal to perform positioning through a side link in a wireless communication system,
Transmitting capability information of the terminal related to positioning to other terminals and base stations;
Receiving positioning configuration information from the other terminal through a side link; and
And performing positioning through a sidelink based on the received positioning configuration information.

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